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Old 09-03-2014, 10:43 AM   #1
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Dometic roof A/C: where to charge it up?

my roof a/c was working last year. this year, although the thermostat was set to the right temp, while genset was running, a/c refused to kick off. i am thinking the freon might be low, but where is the charge port? appreciate advice.
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Old 09-03-2014, 11:01 AM   #2
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They have to be modified to recharge freon, there are no charging ports. Find the right tech and he can probably solder some ports into the system.
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Old 09-03-2014, 11:02 AM   #3
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my roof a/c was working last year. this year, although the thermostat was set to the right temp, while genset was running, a/c refused to kick off. i am thinking the freon might be low, but where is the charge port? appreciate advice.
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Unlike dash A/Cs and residential A/Cs most RV roof airs are not rechargeable, ...
Sadly they are a "throw away appliance", (even after some tech solders some ports into the system).
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Old 09-03-2014, 08:41 PM   #4
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If not starting then get a manual and voltmeter and check it out.

If low freon it would make noise or try...sounds like lack of power or bad control.
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Old 09-03-2014, 08:54 PM   #5
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'Refused to kick off' isn't much of description. What exactly are the symptoms?

In any event low freon is probably one of the least likely problems, and even if that is the case then typical rooftop RV A/C units are not designed to have the refrigerant refilled. It can be done but more often replacement of the unit is a better idea. But again, your problem is more likely something easily repairable, perhaps just a control board or start capacitor.
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Old 09-03-2014, 09:16 PM   #6
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Low coolant would perhaps first show up by causing freezing up of the evaporator coil. They really aren't meant to recharge, it's an iffy fix to have ports added to add freon. I'd check the board and starting capacitor, if those items check out, it's probably time to replace it.
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Old 09-04-2014, 02:12 PM   #7
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If you find a certified rv air conditioner tech they should have no problem recharging your air conditioner. All appliances on a rv can be repaired its cheaper to repair than replace.
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Old 09-04-2014, 02:29 PM   #8
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If you find a certified rv air conditioner tech they should have no problem recharging your air conditioner.
Good luck with that.
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Old 09-04-2014, 03:09 PM   #9
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Yepp that's a closed system.
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Old 09-04-2014, 03:23 PM   #10
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Called a hvac wholesale supplier in the next town we were going which was Memphis. They recommended a guy that could do it and be far. I called him and told him what the wholesaler said. He met me there, fixed the leak and installed a charging port, and filled it with 410A. $125.00. Been working for over 4 months now.
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Old 09-04-2014, 03:29 PM   #11
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If you find a certified rv air conditioner tech they should have no problem recharging your air conditioner. All appliances on a rv can be repaired its cheaper to repair than replace.


Glad you joined, but saying, "All appliances on a rv can be repaired its cheaper to repair than replace." is a bit simplistic. An A/C rooftop unit costs from $420-650, according to size and manufacturer. A service call to evacuate, add ports, recharge, check and lube has got to cost about $200. That's about 1/4 to 1/3 cost of a new one and you still have a 15 year old air conditioner. Sometimes it's best to replace instead of repair. Many are finding this, especially in the case of the Dometic 1200 fridges. They are replacing with home fridges and sleeping without their asbestos pajamas!
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Old 09-04-2014, 03:31 PM   #12
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He met me there, fixed the leak and installed a charging port, and filled it with 410A.
Was the unit originally equipped with 410A? If not then I'd be keeping an eye out for a replacement.
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Old 09-04-2014, 05:07 PM   #13
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Was the unit originally equipped with 410A? If not then I'd be keeping an eye out for a replacement.

Mack 8. Yes
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Old 09-05-2014, 09:29 AM   #14
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thanks everyone. i was driving 440 miles yesterday a little overstretch, lol, but made it to thunder bay. now i am sitting down checking this board...

"refused to kick off", actually there was no noise from the roof units, just nothing. there is a due zone thermostat, could that be cooked due to the high temp when i was in las vegas? heat could do a lot of harm... is there a way to rule out thermostat failure? it's also made by dometic.
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